Manifolding carbon paper



Patented May 6, 1930 UNITED STATES JOHN HUTCHINSON REID, OF JAMESTOWN, NORTH DAKOTA MANIFOLDING CARBON PAPER Application filed December 12, 1928. Serial 110. 325,609.

My invention relates particularly to manifolding carbon paper such as is most largely used in typewriting for production of dupl1- cate impressions; and my object is to provide 6 in a simple and economical way for enabling the easy separation of the piled sheets.

The inconvenience and loss of time commonly involved in effecting such separation has been recognized, and efiort has been made 10 to facilitate the operation by providing spe cially shaped carbon sheets adapted to enable independent gripping and removal of them without the usual complete disarranging of the typed sheets between which they are interposed. Such eiforts however have heretofore involved offsetting disadvantages particularly as to cost of the special carbons, which have prevented the satisfactory remedying of the trouble which my simple invention practically accomplishes as hereinafter fully set forth in connection with the accompanying drawing and as vclearly defined 1n the sub oined claim.

Fig. lis a plan view of a manifolding sheet of carbon paper formed in accordance with my invention; and Fig. 2 is a diagrammatic view of a large sheetof carbon paper showing the lines on which a number of the manifolding sheets are simply cut therefrom so as to form each of the latter as shown in Fig. 1 without waste of material.

Facilitating of the separation of the carbon sheets from the impression sheets with which they are piled may obviously be provided for by enabling independent gripping of the twosets of sheets, so as to permit with drawal of the carbon sheets jointly and with out substantially disarranging the impression sheets. The accomplishment of this in a practically satisfactory way however, requires in the first placethat the gripping and withdrawing action be most effectively and safely exerted to overcome the slight adhesion between the piled sheets; in the second 45 lace that any special forming of the sheets be simple and unobj ectionable in the handling of them; and in the third place that such special sheets be furnishable without objectionable increase in cost of production or de crease in their useful life. Unless these reportion a; which latter alone is specially formed so as to provide for enabling independent gripping of the carbon sheets and of the impression sheets piled therewith. This provision consists simply of a lateral grip-extension b on one corner, and a corresponding cut-away 0 on the laterally opposite corner of the top edge a of the sheet; this arrangement leaving edges 0; d and e of the sheet, clear of any interference with the usual tapping operation for evening the piled sheets both endwise and laterally; and also providing for theexerting of the separating pull in the line of least resistance, that is crosswise of the sheets and along one edge a there of so that the least adhering resistance needs to be overcome in the initial changing of the relative positions of the otherwise easily movable sheets. The shape and size of the lateral grip extension b may be such as to provide for very satisfactory gripping without objectionable efi'ect; and also without involving waste of material as is articularly brought out in connection with ig. 2. As a matter of fact this grip-extension may be made of sufi'icient size to enable its foldingover if desired, on the upper carbon sheet of a pile, for preventing finger contact with the carbon surface in withdrawing the sheets, without interfering at all with full use of the sheet in making impressions or with economic production of the sheets.

As already stated, this matter of economic production of the sheets is of practically vital importancein attaining desired facility of sheet separation-the importance of the lat- 95 ter being unduly belittled when opposed by increased cost of material.

This objection is tpractically eliminated in the manufacture o my simply but importantly improved sheets, as is clearly indi- 100 cated in Fig. 2. In cutting the small manifolding sheets shown in Fig. 1, from a large sheet or roll indicated in Fig. 2, the forming of the grip-extensions b and of the corresponding cut-aways 0, on laterally-opposite corners of one end edge a, is accomplished as indicated without involving any waste of material, the material which forms each grip extension being provided by the cut-away from an unusable portion of an adjacent small sheet, and such corresponding cut-away in the latter serving the essential purpose of providing for independent grippin of the impression sheets with which it is to e piled in service.

It will be seen that the apparent simplicity of my invention is in fact an essential to practical solution of a simple but annoying problem heretofore sought to be solved without the actual success attained by my improvements. 7

What I claim is:

A manifolding carbon sheet of rectangular shape, having an end portion thereof formed with a cut-out on one side and a grip-extension on the opposite side, said cut-out and grip-extension eing identical in form and size.

In testimony whereof I aflix my signature.

JOHN HUTCHINSON REID. 

